Rail pressure control method and device of diesel engine, electronic equipment and storage medium

Abstract

This disclosure provides a rail pressure control method, device, electronic equipment, and storage medium for a diesel engine, relating to the field of engine technology. The method includes: if the engine parameters in the vehicle are within a set range, detecting a sudden load shedding operation of the vehicle using the engine parameters and pilot pressure, wherein the engine parameters include the engine's circulating fuel quantity and rail pressure, and the circulating fuel quantity is the output fuel quantity of the injector; if a sudden load shedding operation is detected, executing an operation to reduce the rail pressure. This disclosure can predict the engine operating condition in advance based on the vehicle's pilot pressure signal and perform rail pressure control, thus avoiding the problem of sudden rail pressure rise during sudden load shedding.

Description

Technical Field

[0001] This disclosure relates to the field of engine technology, and in particular to a rail pressure control method, device, electronic equipment, and storage medium for a diesel engine. Background Technology

[0002] When diesel engine vehicles such as excavators are in operation, the amount of fuel injected will drop instantly when the load is suddenly reduced.

[0003] In related technologies, the fuel metering unit does not reduce its opening accordingly in this situation, which will cause the fuel supply in the common rail to be greater than the fuel output, resulting in a sudden increase in pressure in the common rail. The rail pressure shock will affect the reliability of the fuel system. Summary of the Invention

[0004] In view of this, the purpose of this disclosure is to provide a rail pressure control method, device, electronic equipment and storage medium for a diesel engine, which can specifically solve existing problems.

[0005] Based on the above objectives, in a first aspect, this disclosure proposes a rail pressure control method for a diesel engine in a diesel engine vehicle. The method includes: if the engine parameters in the vehicle are within a set range, detecting a sudden load shedding operation of the vehicle using the engine parameters and pilot pressure, wherein the engine parameters include the engine's circulating oil quantity and rail pressure, and the circulating oil quantity is the output oil quantity of the injector; if a sudden load shedding operation is detected, performing an operation to reduce the rail pressure.

[0006] Secondly, a rail pressure control device for a diesel engine is also provided for a diesel engine vehicle. The device includes: a detection unit configured to detect a sudden load shedding operation of the vehicle by means of the engine parameters and pilot pressure if the engine parameters in the vehicle are within a set range, wherein the engine parameters include the engine's circulating oil quantity and rail pressure, and the circulating oil quantity is the output oil quantity of the injector; and an execution unit configured to perform an operation to reduce the rail pressure if a sudden load shedding operation is detected.

[0007] Thirdly, an electronic device is also provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor running the computer program to implement the method of the first aspect.

[0008] Fourthly, a computer-readable storage medium is also provided, on which a computer program is stored, the computer program being executed by a processor to implement the method described in any one of the first aspects.

[0009] Fifthly, a computer program product is also provided, comprising a computer program that is executed by a processor to implement the method described in any one of the first aspects.

[0010] In summary, this disclosure has at least the following beneficial effects: Since the change in pilot pressure precedes the change in common rail oil output, the engine operating condition can be predicted in advance based on the vehicle pilot pressure signal, and rail pressure control can be performed to avoid the problem of sudden increase in rail pressure during sudden load reduction. Attached Figure Description

[0011] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this disclosure and should not be construed as limiting the scope of this disclosure.

[0012] Figure 1 A flowchart of a rail pressure control method for a diesel engine according to an embodiment of the present disclosure is shown; Figure 2 Another flowchart of a rail pressure control method for a diesel engine according to an embodiment of the present disclosure is shown; Figure 3 A schematic diagram of a rail pressure control device for a diesel engine according to an embodiment of the present disclosure is shown; Figure 4 A schematic diagram of the structure of an electronic device provided in an embodiment of the present disclosure is shown; Figure 5 A schematic diagram of a storage medium provided according to an embodiment of the present disclosure is shown. Detailed Implementation

[0013] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0014] It should be noted that, unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other. This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0015] Figure 1 A rail pressure control method for a diesel engine according to this disclosure is illustrated. In embodiments of this disclosure, the method is used in vehicles with diesel engines and includes: Step S101: If the engine parameters in the vehicle are within a set range, the sudden load unloading operation of the vehicle is detected by the engine parameters and pilot pressure. The engine parameters include the engine's circulating oil volume and rail pressure, and the circulating oil volume is the output oil volume of the injector.

[0016] Step S102: If a sudden load unloading operation is detected, an operation to reduce rail pressure is performed.

[0017] In this embodiment, the entity executing the rail pressure control method for the diesel engine can detect a sudden load unloading operation, i.e., a drop in pilot pressure, when the rail pressure and circulating fuel quantity are within their respective set ranges. If this is detected, an operation to reduce rail pressure fluctuations is executed. Here, rail pressure fluctuations may increase in the current scenario, so an operation to reduce rail pressure can be performed. Circulating fuel quantity refers to the output fuel quantity of each injector; the fuel quantity output from the common rail is distributed to multiple injectors.

[0018] Because the change in pilot pressure precedes the change in common rail oil output, this disclosure allows for advance prediction of engine operating conditions based on the vehicle pilot pressure signal, and rail pressure control, thus avoiding the problem of sudden rail pressure rise during sudden load reduction.

[0019] In some optional implementations of any embodiment of this disclosure, the step of detecting the sudden load unloading operation of the vehicle by means of engine parameters and pilot pressure includes: if it is detected that the circulating oil volume reaches a corresponding set value, the rail pressure reaches a corresponding set value, the pilot pressure is less than a preset threshold, and the pilot pressure drop rate is greater than a corresponding set value, then it is determined that the sudden load unloading operation of the vehicle has been detected.

[0020] In these implementation methods, the circulating oil quantity, rail pressure, and pilot pressure descent rate each have corresponding set values. If the circulating oil quantity is greater than or equal to the corresponding set value, and the rail pressure is greater than or equal to the corresponding set value, then the engine parameters meet the preset conditions.

[0021] By using parameters of the engine that reflect rail pressure, and parameters of the pilot pressure that reflect rail pressure, the current real-time situation of rail pressure rise is evaluated, thereby identifying the opportune time to perform operations to reduce rail pressure fluctuations.

[0022] In some optional implementations of any embodiment of this disclosure, the operation of reducing rail pressure includes: updating the current feedforward oil quantity by means of a correction factor, wherein the correction factor is determined by the current pilot pressure and the pilot system pressure.

[0023] Among these optional implementations, the feedforward fuel quantity can be updated via a transition. The current feedforward fuel quantity is calculated based on engine speed and fuel flow rate, i.e., common rail output.

[0024] Optionally, the duration of the update process is adjustable to prevent signal abrupt changes, and this duration is on the order of milliseconds.

[0025] These methods control the sudden increase in rail pressure without affecting engine economy, preventing engine speed spikes, resulting in better overall vehicle smoothness and an improved driving experience.

[0026] Optionally, updating the current feedforward oil quantity using a correction coefficient includes: multiplying the feedforward oil quantity before the update by the correction coefficient to obtain the updated feedforward oil quantity, wherein the correction coefficient is the ratio of the system pilot pressure to the current pilot pressure.

[0027] In these optional implementations, the updated feedforward flow rate is transitioned by multiplying the original feedforward flow rate by a correction factor fac1. The correction factor fac1 is calculated by dividing the current pilot pressure by the system pilot pressure, and the transition time can be calibrated. The current pilot pressure varies with the driver's operation, while the system pilot pressure is a fixed parameter of the system. In some cases, the circulating oil quantity can also be multiplied by the reciprocal of the correction factor to obtain the new circulating oil quantity. The original feedforward oil quantity can be generated based on the engine speed and the new circulating oil quantity.

[0028] Because changes in the current pilot pressure precede changes in the circulating oil volume (approximately 50ms in advance), the feedforward oil volume response time is faster. This allows the oil volume metering unit to act earlier, reducing the common rail oil supply and thus minimizing the magnitude of rail pressure surges. A correction coefficient is calculated, and accurate updates are achieved by multiplying this coefficient.

[0029] In some optional implementations of any embodiment of this disclosure, the operation of reducing rail pressure includes: calculating the fuel flow rate to be used based on rail pressure deviation and PID parameters, obtaining a calculation result, wherein the fuel flow rate is the common rail inlet flow rate; and switching the current fuel flow rate using the calculation result.

[0030] In these optional implementations, the PID parameters can be preset values. The current fuel flow rate is switched, and the result of the switch is the calculated result. The fuel flow rate is the amount of fuel entering the common rail.

[0031] Various methods can be used to calculate the fuel flow rate based on the rail pressure deviation. For example, the rail pressure deviation can be multiplied by the PID parameters to obtain the fuel flow rate. Alternatively, the rail pressure deviation can be input into a preset model to obtain the fuel flow rate to be used, which is output from the model.

[0032] In some cases, various methods can be used to determine the fuel flow rate used for the opening of the fuel metering unit based on the feedforward fuel quantity. Specifically, the switched fuel flow rate and the updated feedforward fuel quantity can be added together to obtain the fuel flow rate used for the opening of the fuel metering unit. This ensures that the calculation results of the fuel metering unit conform to the current actual operating conditions. By adding the fuel flow rates to calculate the opening of the fuel metering unit, a larger fuel flow rate corresponds to a smaller metering unit opening, thereby reducing the amount of fuel entering the common rail, i.e., reducing the fuel supply, and thus reducing rail pressure surge.

[0033] These implementation methods can calculate accurate and timely fuel flow rates based on real-time rail pressure deviation.

[0034] In some optional implementations of any embodiment of this disclosure, the operation of reducing rail pressure includes: updating the rail pressure to the rail pressure corresponding to the current pilot pressure in response to a decrease in pilot pressure, and updating the rail pressure deviation to the rail pressure deviation corresponding to the current pilot pressure.

[0035] In these implementation methods, the correspondence can be a correspondence table or a model. These implementation methods can set the rail pressure to decrease in advance following the pilot pressure, and the rail pressure deviation to increase in advance, thereby improving the response speed of the metering unit when the pilot pressure changes.

[0036] Figure 2 A rail pressure control method for a diesel engine according to an embodiment of this disclosure is shown. For example... Figure 2 As shown, the circulating fuel quantity can be updated by multiplying it by a correction coefficient. After updating, a new circulating fuel quantity, Cor, is obtained. When a sudden load unloading operation is detected, circulating fuel quantity 1 equals circulating fuel quantity Cor through a switch switch. The rail pressure deviation between the set rail pressure and the actual rail pressure is multiplied by the PID2 parameter to obtain the fuel flow rate. Feedforward fuel quantity 1 is the feedforward fuel quantity before the update, and feedforward fuel quantity 2 is the updated feedforward fuel quantity. Feedforward fuel quantity 1 is multiplied by the correction coefficient fac2 to obtain feedforward fuel quantity 2. After positive and negative filtering times to prevent signal abrupt changes, the final feedforward fuel quantity is taken as feedforward fuel quantity 2. Then, the final feedforward fuel quantity and the fuel flow rate are added together to obtain the fuel flow rate used for the fuel metering unit opening.

[0037] This disclosure provides a rail pressure control device for a diesel engine, which is used to execute the rail pressure control method for a diesel engine described in the above embodiments, such as... Figure 3As shown, for a vehicle with a diesel engine, the device 300 includes: a detection unit 301 configured to detect a sudden load shedding operation of the vehicle by means of the engine parameters and pilot pressure if the engine parameters in the vehicle are within a set range, the engine parameters including the engine's circulating oil quantity and rail pressure, the circulating oil quantity being the output oil quantity of the injector; and an execution unit 302 configured to execute an operation to reduce the rail pressure if a sudden load shedding operation is detected.

[0038] The rail pressure control device for diesel engines provided in the above embodiments of this disclosure and the rail pressure control method for diesel engines provided in the embodiments of this disclosure are based on the same inventive concept and have the same beneficial effects as the methods adopted, run or implemented by their stored applications.

[0039] This disclosure also provides an electronic device corresponding to the rail pressure control method for a diesel engine provided in the foregoing embodiments, for executing the aforementioned rail pressure control method for the diesel engine. This disclosure is not limiting.

[0040] Please refer to Figure 4 This illustrates a schematic diagram of an electronic device provided by some embodiments of the present disclosure. For example... Figure 4 As shown, the electronic device 40 includes: a processor 400, a memory 401, a bus 402, and a communication interface 403. The processor 400, the communication interface 403, and the memory 401 are connected via the bus 402. The memory 401 stores a computer program that can run on the processor 400. When the processor 400 runs the computer program, it executes the method provided in any of the foregoing embodiments of this disclosure.

[0041] The memory 401 may include high-speed random access memory (RAM) or non-volatile memory, such as at least one disk storage device. Communication between this system network element and at least one other network element is achieved through at least one communication interface 403 (which can be wired or wireless), such as the Internet, wide area network, local area network, or metropolitan area network.

[0042] Bus 402 can be an ISA bus, PCI bus, or EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. The memory 401 is used to store programs. After receiving an execution instruction, the processor 400 executes the program. The rail pressure control method for the diesel engine disclosed in any of the foregoing embodiments of this disclosure can be applied to the processor 400, or implemented by the processor 400.

[0043] The processor 400 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of the processor 400 or by instructions in software form. The processor 400 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this disclosure. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this disclosure can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 401. The processor 400 reads the information in memory 401 and, in conjunction with its hardware, completes the steps of the above method.

[0044] The electronic equipment provided in this disclosure and the rail pressure control method for diesel engines provided in this disclosure are based on the same inventive concept and have the same beneficial effects as the methods they employ, operate, or implement.

[0045] This disclosure also provides a computer-readable storage medium corresponding to the rail pressure control method for a diesel engine provided in the foregoing embodiments. Please refer to... Figure 5 The computer-readable storage medium shown is an optical disc 50, on which a computer program (i.e., a program product) is stored. When the computer program is run by a processor, it executes the rail pressure control method for a diesel engine provided in any of the foregoing embodiments.

[0046] It should be noted that examples of the computer-readable storage medium may also include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other optical and magnetic storage media, which will not be elaborated here.

[0047] The computer-readable storage medium provided in the above embodiments of this disclosure and the rail pressure control method for a diesel engine provided in the embodiments of this disclosure are based on the same inventive concept and have the same beneficial effects as the methods adopted, run or implemented by the application programs stored therein.

[0048] It should be noted that: In the foregoing text, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in this disclosure is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0049] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this disclosure, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of this disclosure.

[0050] The embodiments of this disclosure have been described above with reference to the accompanying drawings. These are merely specific implementations of this disclosure, but this disclosure is not limited to the specific implementations described above. The specific implementations described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this disclosure without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this disclosure.

Claims

1. A rail pressure control method for a diesel engine, characterized in that, For a vehicle with a diesel engine, the method includes: If the engine parameters in the vehicle are within the set range, the sudden load unloading operation of the vehicle is detected by the engine parameters and pilot pressure. The engine parameters include the engine's circulating oil volume and rail pressure, and the circulating oil volume is the output oil volume of the injector. If a sudden unloading operation is detected, operations to reduce rail pressure are performed.

2. The method according to claim 1, characterized in that, The method of detecting the sudden load unloading operation of the vehicle using the engine parameters and pilot pressure includes: If the circulating oil volume reaches the corresponding set value, the rail pressure reaches the corresponding set value, the pilot pressure is less than the preset threshold, and the pilot pressure drop rate is greater than the corresponding set value, then it is determined that a sudden unloading operation of the vehicle has been detected.

3. The method according to claim 1, characterized in that, The operation of reducing rail pressure includes: The current feedforward oil quantity is updated by a correction factor, wherein the correction factor is determined by the current pilot pressure and the pilot system pressure.

4. The method according to claim 3, characterized in that, The process of updating the current feedforward oil quantity through a correction coefficient includes: The updated feedforward oil quantity is obtained by multiplying the previous feedforward oil quantity by the correction factor, wherein the correction factor is the ratio of the system pilot pressure to the current pilot pressure.

5. The method according to claim 4, characterized in that, The operation of reducing rail pressure includes: Based on the rail pressure deviation and PID parameters, the fuel flow rate to be used is calculated, and the calculation result is obtained. The fuel flow rate is the common rail inlet amount. Using the calculation results, switch the current fuel flow rate.

6. The method according to claim 5, characterized in that, The method further includes: The fuel flow rate after switching and the updated feedforward fuel quantity are added together to obtain the fuel flow rate used for the opening of the fuel quantity metering unit.

7. The method according to claim 1, characterized in that, The operation of reducing rail pressure includes: In response to a decrease in pilot pressure, the rail pressure is updated to the rail pressure corresponding to the current pilot pressure, and the rail pressure deviation is updated to the rail pressure deviation corresponding to the current pilot pressure.

8. A rail pressure control device for a diesel engine, characterized in that, For use in vehicles with diesel engines, the device includes: The detection unit is configured to detect the sudden load unloading operation of the vehicle by means of the engine parameters and the pilot pressure if the engine parameters in the vehicle are within a set range. The engine parameters include the circulating oil volume and rail pressure of the engine, and the circulating oil volume is the output oil volume of the injector. The execution unit is configured to perform operations to reduce rail pressure if a sudden unloading operation is detected.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, The processor executes the computer program to implement the method as described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, The computer program is executed by a processor to implement the method as described in any one of claims 1-7.

Images